Circulo is a game of visual geometric calibration. Your objective is to scale a circle's area relative to a baseline size using a given multiplier factor — across five increasingly demanding modes.
The core challenge. 5 rounds of compounding area scaling. Each round's multiplier applies to the circle you actually drew in the previous round, so errors snowball. Aim for 90%+ average to secure top rank rewards.
Infinite rounds with a Vitality bar that starts at 100%. Each inaccurate estimate drains it — the worse the miss, the steeper the drain. Near-perfect draws (95%+) restore a little energy. Multipliers escalate dynamically. Survive as long as you can.
A perception flip. You're shown two circles — a baseline and a target — and must use the slider to estimate the exact scale factor between them. You don't draw anything; instead you read the visual ratio and dial it in with precision.
Spatial summation challenge. 2–4 small circles are scattered around the canvas. Draw a single central circle whose area equals the total combined area of all small circles. Watch them animate inward to merge and reveal your accuracy.
Zero-consequence training. Adjust the target multiplier freely, toggle visual guide outlines on/off, clear and redraw without penalty. Perfect for building spatial intuition before jumping into ranked runs.
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